XSS in Znuny

CVE-2026-50591

In Znuny LTS before 6.5.21 and Znuny before 7.3.3, XSS can occur via stored user preferences.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Znuny — versions 6.0.0, 7.0.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

cve@mitre.org

Frequently asked questions

What is CVE-2026-50591?: CVE-2026-50591 is a medium-severity vulnerability in Znuny, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-06-05.
How severe is CVE-2026-50591?: Medium severity. CVSS v3 base score is 5.4 out of 10.